Steven A. Vanstrien, 59, pleaded not guilty in Ayer District Court in November to 18 charges: possession of an incendiary device, chemical/biological or nuclear weapon (two counts); possession of a large-capacity firearm (seven counts); carrying a firearm without a license (two counts); possession of explosives; possession of a Class A drug; possession of ammunition without a firearms identification card; and improper storage of a firearm (three counts). Vanstrien is being held on $3,500 cash bail. He has been ordered to stay away from his home, 5 Pershing St.

Vanstrien's attorney, Larry Colby, declined comment.

Police allege they found several "homemade'' explosive-type devices during a Nov. 4 search.

According to court documents, Westford police, the state police bomb squad, FBI and federal Alcohol, Tobacco and Firearms agents inspected the devices and said they were dangerous.

Documents state that officers also found:

* Boxes of chemicals, tools, literature and measuring devices.

* A silver .22-caliber firearm in a plastic container, along with ammunition.

* A Colt MK4 .45-caliber with two magazines and a 9 mm with two magazines, under Vanstrien's mattress. All four magazines were loaded. None had trigger locks. The weapons were wedged between the mattress and the box spring.

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* Boxes of various ammunition, switchblades and additional explosive devices.

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